{{sfn|Smith|1991|p=}}

* {{cite book | last=Smith | first=Huston | title=The World's Religions | publisher=Harper Collins | publication-place=San Francisco, Calif | date=1991-09-13 | isbn=978-0-06-250811-9}}

<ref name="d920">{{cite book | last=Smith | first=Huston | title=The World's Religions | publisher=Harper Collins | publication-place=San Francisco, Calif | date=1991-09-13 | isbn=978-0-06-250811-9 | page=}}</ref>